win/clang: Fix all remaining -Wformat warnings.

sandbox/win/sandbox_poc/pocdll/fs.cc

Index: sandbox/win/sandbox_poc/pocdll/fs.cc
diff --git a/sandbox/win/sandbox_poc/pocdll/fs.cc b/sandbox/win/sandbox_poc/pocdll/fs.cc
index aafb9a5f20da90e4d31a9940a85d850b3e407eac..40596af6dd7f48466e8f4e55753c9fa1ce238d89 100644
--- a/sandbox/win/sandbox_poc/pocdll/fs.cc
+++ b/sandbox/win/sandbox_poc/pocdll/fs.cc
@@ -14,7 +14,7 @@ void TryOpenFile(const wchar_t *path, FILE *output) {
   wchar_t path_expanded[MAX_PATH] = {0};
   DWORD size = ::ExpandEnvironmentStrings(path, path_expanded, MAX_PATH - 1);
   if (!size) {
-    fprintf(output, "[ERROR] Cannot expand \"%S\". Error %d.\r\n", path,
+    fprintf(output, "[ERROR] Cannot expand \"%S\". Error %ld.\r\n", path,
             ::GetLastError());
   }
 
@@ -32,7 +32,7 @@ void TryOpenFile(const wchar_t *path, FILE *output) {
             file);
     ::CloseHandle(file);
   } else {
-    fprintf(output, "[BLOCKED] Opening file \"%S\". Error %d.\r\n", path,
+    fprintf(output, "[BLOCKED] Opening file \"%S\". Error %ld.\r\n", path,
             ::GetLastError());
   }
 }